A flare is used to convert unburned gases to innocuous products such as CO2 and H2O. If a gas of the following composition (in percent) is burned in the flare—CH4 70%, C3H8 5%, CO 15%, O2 5%, N2 5%—and the flue gas contains 7.73% CO2, 12.35% H2O, and the balance is O2 and N2, what was the percent excess air used?
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